//
// Copyright (c) 2008-2011, Kenneth Bell
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the "Software"),
// to deal in the Software without restriction, including without limitation
// the rights to use, copy, modify, merge, publish, distribute, sublicense,
// and/or sell copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
//

using System;
using DiscUtils.Streams;

namespace DiscUtils.Udf
{
    internal class InformationControlBlock : IByteArraySerializable
    {
        public AllocationType AllocationType;
        public FileType FileType;
        public InformationControlBlockFlags Flags;
        public ushort MaxEntries;
        public LogicalBlockAddress ParentICBLocation;
        public uint PriorDirectEntries;
        public ushort StrategyParameter;
        public ushort StrategyType;

        public int Size
        {
            get { return 20; }
        }

        public int ReadFrom(byte[] buffer, int offset)
        {
            PriorDirectEntries = EndianUtilities.ToUInt32LittleEndian(buffer, offset);
            StrategyType = EndianUtilities.ToUInt16LittleEndian(buffer, offset + 4);
            StrategyParameter = EndianUtilities.ToUInt16LittleEndian(buffer, offset + 6);
            MaxEntries = EndianUtilities.ToUInt16LittleEndian(buffer, offset + 8);
            FileType = (FileType)buffer[offset + 11];
            ParentICBLocation = EndianUtilities.ToStruct<LogicalBlockAddress>(buffer, offset + 12);

            ushort flagsField = EndianUtilities.ToUInt16LittleEndian(buffer, offset + 18);
            AllocationType = (AllocationType)(flagsField & 0x3);
            Flags = (InformationControlBlockFlags)(flagsField & 0xFFFC);

            return 20;
        }

        public void WriteTo(byte[] buffer, int offset)
        {
            throw new NotImplementedException();
        }
    }
}